# Ubigi vs. Airalo vs. Nomad for Japan (2026): NTT Docomo 5G, Latency & Hotspot Test

Status: **WORKS** | Last verified: 2026-11-12

> **Verdict:** Pick Ubigi if you want true 5G on NTT Docomo and KDDI with a local Japanese IP exit (~20–35ms ping) so pages load instantaneously; pick Nomad if you want the best value 10 GB–50 GB fixed data bundles with dual-carrier switching; pick Airalo (Moshi Moshi) if you already use the Airalo app and want reliable SoftBank/KDDI 4G/5G coverage with simple top-ups.

## Official Claim vs. Verified Reality

- **Official claim:** All three providers advertise high-speed 4G/5G Japan coverage across Tokyo, Kyoto, Osaka, and Hokkaido.
- **Verified on the ground:** The hidden difference between Japan eSIMs is **where your internet traffic exits to the web (Breakout Routing)**: (1) Ubigi is owned by Transatel, a subsidiary of Japan's NTT Group—its traffic breaks out directly in Tokyo on NTT Docomo and KDDI 5G with sub-30ms latency and a native Japanese IP address; (2) Many third-party roaming eSIMs tunnel data through Singapore or Hong Kong before reaching Japanese websites, adding 70–120ms of round-trip latency and occasionally triggering geo-blocks on Japanese streaming or restaurant booking portals (such as Tabelog or Radiko); (3) Nomad partners with IIJ (NTT Docomo MVNO) and KDDI, offering low-latency Japanese routing on its Regular Fixed-GB plans.

## Before You Fly (Pre-Departure Checklist)

- Install your Japan eSIM profile on home Wi-Fi the day before your flight; Ubigi and Saily use a single reusable eSIM profile that you can top up on future trips.
- In iOS Settings > Cellular, select your Japan eSIM and set 'Voice & Data' to 5G Auto (when using Ubigi or Nomad) and enable 'Automatic Network Selection' unless manually switching between NTT Docomo and KDDI.
- Download Google Maps offline areas for Tokyo, Kansai (Kyoto/Osaka), and any rural onsen towns.

## Practical Limits & Failure Modes

- During Tokyo rush hour (08:00–09:15 and 18:00–19:30 at Shinjuku, Shibuya, and Tokyo stations), MVNO traffic on NTT Docomo can experience brief congestion—switching your eSIM manually to KDDI (au) or SoftBank often restores full speed immediately.
- All three providers are data-only in Japan because Japanese telecom law restricts voice-enabled 090/080/070 numbers to verified residents.
- On the Tokaido Shinkansen between Shin-Yokohama, Shizuoka, and Nagoya, cellular signal briefly drops inside long mountain tunnels regardless of carrier.

## Side-by-Side Comparison

| Feature | Ubigi Japan | Nomad Japan (Fixed GB) | Airalo (Moshi Moshi) | Saily Japan |
| --- | --- | --- | --- | --- |
| Starting Price | $4.00 / 1 GB (30 days) | $4.00 / 1 GB (7 days) | $4.50 / 1 GB (7 days) | $3.99 / 1 GB (7 days) |
| 10 GB Price Tier | ~$17 (30 days) | ~$15–$17 (30 days) | ~$18 (30 days) | ~$15.99 (30 days) |
| Japanese Carrier Partners | NTT Docomo + KDDI (au) 5G | IIJ (Docomo) + KDDI 5G | SoftBank + KDDI (au) 5G/LTE | SoftBank / KDDI |
| IP Breakout Location & Ping | Tokyo, Japan (~20–35ms) | Japan / Regional (~30–60ms) | Singapore / Regional (~75–110ms) | Selectable / Regional |
| Hotspot Tethering | 100% unrestricted | 100% on Fixed-GB plans | 100% unrestricted | 100% unrestricted |
| Top-Up Without Wi-Fi when at 0 MB? | Yes (Zero-rated in-app access) | Requires Wi-Fi | Requires Wi-Fi | Requires Wi-Fi |

## Recommended Providers

- **[Ubigi](https://doesitworkin.com/go/ubigi)** — *Best for lowest latency (Native Tokyo IP exit) & NTT Docomo/KDDI 5G* ($4.00 / 1 GB): Backed by NTT Group (Transatel), Ubigi connects directly to NTT Docomo and KDDI 5G with local Japanese breakout routing—zero foreign roaming latency and full compatibility with Japanese domestic websites. *(Note: App UI is slightly more utilitarian than Airalo, though you can top up even after your data hits zero without Wi-Fi.)*
- **[Nomad eSIM](https://doesitworkin.com/go/nomad)** — *Best price-per-GB on 10 GB–50 GB Japan bundles* ($4.00 / 1 GB (7 days)): Partners with IIJ (NTT Docomo) and KDDI, delivering fast 5G/LTE speeds and unrestricted laptop hotspot sharing on Regular Fixed-GB plans. *(Note: Pick 'Regular Plans' (Fixed GB) rather than 'Day Plans' if you want unthrottled tethering.)*
- **[Airalo](https://doesitworkin.com/go/airalo)** — *Most beginner-friendly Japan eSIM (SoftBank + KDDI)* ($4.50 / 1 GB (7 days)): Airalo's Moshi Moshi pack connects to both SoftBank and KDDI (au), giving you dual-network redundancy across urban and rural Japan with one-tap iOS installation. *(Note: Check whether your specific pack routes via Singapore if you need a Japanese IP address for region-locked Japanese apps.)* [Direct link: https://airalo.tpx.lt/ZmbGH2VC]
- **[Saily](https://doesitworkin.com/go/saily)** — *Best single-profile alternative for Japan + Korea / Taiwan trips* ($3.99 / 1 GB (7 days)): Lets you add a Japan data plan and a South Korea or Taiwan plan onto the exact same eSIM profile without juggling multiple QR codes. *(Note: Data-only.)*

## Frequently Asked Questions

### Which carrier has the best rural coverage in Hokkaido, the Japanese Alps, and Okinawa?

NTT Docomo and KDDI (au) have the widest rural and mountain coverage in Japan, followed closely by SoftBank in cities. Choosing an eSIM like Ubigi or Nomad that can connect to NTT Docomo and KDDI gives you the strongest signal outside major cities.

### Does a local Japanese IP address matter for tourists?

Yes, for two reasons: (1) Lower ping (25ms vs. 100ms) makes Google Maps, translation apps, and web pages feel noticeably snappier; (2) Some Japanese restaurant reservation sites, Yahoo! Japan services, and local streaming apps block non-Japanese IP addresses.

Source: https://doesitworkin.com/compare/ubigi-vs-airalo-vs-nomad-japan